英文中用得最广泛的原因状语从句是由because引导的，但也有as，since引导的。as, since，because都可引导原因状语从句；because用来回答“为什么”的答案，或用来澄清疑惑。 As和since多用于解释，而不是提供“为什么”的答案，翻译时，在句子中的位置比较灵活， 连接词as也可以不译。
比如：
As it is getting late you may stay here for the night.
天晚了，你就在这儿过夜吧。（注：以天晚解释留宿的原因。）
As状语从句可以用作时间状语从句，时间概念介于when和while之间。
1. Australian employment fell in September, the first decline in more than a year, as manufacturers and banks dismissed workers to cut costs, the government said Thursday.
（澳大利亚）政府星期四说，由于制造业及银行业解雇员工以削减生产成本，澳大利亚就业率在九月份出现下跌，这是一年多来就业率首次下跌。
2. As international travel booms, the United States is fast losing market share—as well as potential tourist dollars—in large part, industry executives say, because for many non-Americans, it has become simply too much of a hassle to get into the country since Sept. 11, 2001.
行业管理人员称，就在世界旅游业日益繁荣之际，美国旅游业却在迅速丧失大量的旅游市场份额，还丢失了有可能赚到的旅游收入，因为自从2001年9▪11事件发生之后，对于很多美国以外国家的老百姓而言，去美国旅游纯属自找麻烦。
Notes:
① As 从句 As international travel booms 表示时间段。
3. As the holiday season begins, families are shopping with confidence because "the economy is gathering added steam and creating more jobs".
在美国长假临近期间，家家户户都在满怀信心地购物，这是因为有数据证明了美国经济已经恢复正常。
Notes:
①as从句表示时间段。
4. Nonetheless, he warned that China's trade surplus with the EU could become a political problem in Europe, as it has in the United States.
但是，他仍然警告说中国对欧盟的贸易顺差可能会成为政治问题，美国就已如此。
Notes:
①as引导方式状语从句。
5. Yet even as the talk from Caracas and Washington grows more hostile and the countries seem to be growing ever farther apart, bilateral trade is surging.
然而，恰恰就在加拉加斯和华盛顿双方的言论日益敌对，两国之间的距离也似乎越来越远的情况下，两国的双边贸易却突飞猛增。
Notes:
①As从句表示时间段
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